Although Randy Travis was reportedly on the mend after being hospitalized this weekend, his rep announced Wednesday night that the singer is undergoing surgery after suffering a stroke.

"As a complication of his congestive heart failure, Mr. Randy Travis has suffered a stroke and is currently undergoing surgery to relieve pressure on his brain," the statement read.

Thursday morning it was announced that surgery had been completed, but he remains in critical condition.

His health has been a concern since Sunday, when he was admitted to a Texas hospital.

The singer, 54, was suffering from complications of recently acquired viral cardiomyopathy.

On Tuesday, the country singer "underwent placement of an Impella peripheral left ventricular assist device for stabilization prior to transferring hospitals," his rep confirmed to PEOPLE in a statement.

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